“…Taxa that are cited but are not in the references can be found in Morbey (1975), Lund (1977) or Achilles (1981). The correct taxonomic assignment for both Corollina and Circulina is now Classopollis , the type species being C. classoides (Traverse, 2004; Skog, 2005). Celyphus stenillensis is interpreted here as a foraminiferal test lining. Figure 5.Vertebrates from the Tytherington fissures.…”
Important vertebrate faunas occur in fissure deposits of Late Triassic-Jurassic age in SW Britain. Although the faunas are well described, their age and palaeoenvironment remain poorly understood. One such fissure system was documented in detail during quarrying operations at Tytherington and has yielded in situ palynomorphs that add much information concerning its age and palaeoenvironment. Significantly, the Tytherington fauna is of the sauropsid type that has generally been dated as Norian or pre-Penarth Group transgression and was also regarded as representing a distinct upland fauna. The palynomorphs, which include a significant marine component, demonstrate that the Tytherington Triassic fissures are infilled with Late Triassic (Rhaetian) sediments that match specific levels in the Westbury Formation. In addition, many of the Tytherington solutional fissures probably formed during the Rhaetian and are consistent with a fluctuating saline to freshwater environment. There is no prima facie evidence of solutional formation and infilling of the reptilebearing deposits before the Rhaetian trangression. The fissure reptile fauna, which includes the early dinosaur Thecodontosaurus, inhabited a small fire-swept limestone island in the Rhaetian sea. The features of the herpetofauna are entirely consistent with this island model which has Quaternary analogues.
“…Taxa that are cited but are not in the references can be found in Morbey (1975), Lund (1977) or Achilles (1981). The correct taxonomic assignment for both Corollina and Circulina is now Classopollis , the type species being C. classoides (Traverse, 2004; Skog, 2005). Celyphus stenillensis is interpreted here as a foraminiferal test lining. Figure 5.Vertebrates from the Tytherington fissures.…”
Important vertebrate faunas occur in fissure deposits of Late Triassic-Jurassic age in SW Britain. Although the faunas are well described, their age and palaeoenvironment remain poorly understood. One such fissure system was documented in detail during quarrying operations at Tytherington and has yielded in situ palynomorphs that add much information concerning its age and palaeoenvironment. Significantly, the Tytherington fauna is of the sauropsid type that has generally been dated as Norian or pre-Penarth Group transgression and was also regarded as representing a distinct upland fauna. The palynomorphs, which include a significant marine component, demonstrate that the Tytherington Triassic fissures are infilled with Late Triassic (Rhaetian) sediments that match specific levels in the Westbury Formation. In addition, many of the Tytherington solutional fissures probably formed during the Rhaetian and are consistent with a fluctuating saline to freshwater environment. There is no prima facie evidence of solutional formation and infilling of the reptilebearing deposits before the Rhaetian trangression. The fissure reptile fauna, which includes the early dinosaur Thecodontosaurus, inhabited a small fire-swept limestone island in the Rhaetian sea. The features of the herpetofauna are entirely consistent with this island model which has Quaternary analogues.
“…In an attempt to clarify the conceptual confusion surrounding morphotaxa, Chaloner (2004) proposed that the Code should include two examples showing how such taxa should be used. This proposal generated "strong opposing opinions" among the Committee for Fossil Plants (Skog, 2005) and, after some discussion, the Committee formulated an alternative proposal: a Note should be added to Article 1.2: "Any fossil taxon that is described as including more than one part, lifehistory stage, or preservational state is not a morphotaxon" . The Committee's secretary (J.E.…”
The provisions in the Code for naming plant fossil taxa have changed substantially over the years. The history of these changes reflects the tension between palaeobotanists (including palynologists studying plant microfossils) who need a flexible set of regulations, and the tendency for the Code to include nomenclatural regulations that constrain taxonomic decisions. The current Vienna Code now provides for plant fossils to be named as fossil taxa, which is a flexible taxonomic concept that should suit the needs of most palaeobotanists. However, the Vienna Code also incorporates the more restrictive concept of morphotaxa and most palaeobotanists seem to be under the misapprehension that plant fossils can only be named as morphotaxa. In our view, the concept of morphotaxa is logically flawed and unnecessary in practice, and should be removed from the Code.
“…Reyre, 1970nom. cons., non Malyavkina, 1949(Traverse, 2004Skog, 2005) is a well-known Mesozoic pollen type that was produced by conifers of the extinct family Cheirolepidiaceae (Taylor & Alvin, 1984). The genus was initially instituted by Pflug (1953) and later emended by Pocock and Jansonius (1961) and Reyre (1970).…”
A morphological study of three different types of dispersed Circumpolles pollen grains from the Toarcian-Aalenian of the Fuentelsaz section (Spain) was performed using conventional wide field and confocal laser scanning microscopy (CSLM). The CSLM data allowed scanning electron microscope-like three-dimensional reconstructions to be made and showed that the most part of the studied pollen have taxonomic features characteristic of the Mesozoic genus Classopollis. At the species level, Classopollis torosus and Classopollis classoides were identified. The third form studied is characterized by the presence of Ubisch bodies adhering to the pollen wall.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
